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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23f89d6f187588dcfc222641d757dc0d4e7f2d7179c98dc7a9e3b37a0a45a6d' 
  AND token = 'sAjsIneRRh7fwANZc5SJrbaz4xLE6Rr4nsy2UV36+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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