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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372a31537c51db72133cab7f2b0c9c8278937afe4071519dac6953cd19a15587' 
  AND token = '41HjincDBRqXEAqYCIcUWUGPHXsTEbrUDWVBrqQZ3v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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