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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce506fcd503e40cd4e945a5211c3a09cddb704a21d43ee1548584d90e5adf6d2' 
  AND token = 'LsGpOJMFEop+Cp2sJVhhLa/V1dReXMNVB8vmmnEC8ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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