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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0eab01729dc8f0d01fd82a6503d1eab5342dff14b5b5c5bba5c0fdd44004ed2' 
  AND token = 'wUX56ghre5h/pMU9lJnbMClDTOypUqI/ihqMIc37g70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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