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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf093c5f9993762326084da8ecbc9ca6b5caf7fc75cf5df9b73814b57e510e42' 
  AND token = 'p7Q9CPTNFF55pOrMRSMz76EqjLC6kgA2hPHMx+K6lnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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