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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c28fd66382544fe1cb3a0cb3842c918e75894445b19bf886045fcc0c33730b4' 
  AND token = 'm/BM+XSfa+jV1QYwEe9Nrx2EJaU/lB/+x/cvEZxzic4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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