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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8c97e075429d7ddb4807a59f4569b106ed8dc9492fd4c56f2b5ecb292839ed' 
  AND token = 'MtubOmI2yzdOnX9lhwZZoZgMPcaUIxYmcS4FOX/4lHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}