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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4a600474e8061fe01126cadbce3b717fa9e588a431c954801082fbd51d4f67' 
  AND token = 'PhxdV4U6fwzBUzh7YL+hAEosGL6EtRnN38HJ3AhDqPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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