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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dc7ef6100c94cb3365bc503f62a623a6e7c8c3c3022a109aacc9040ae86746' 
  AND token = 'YXfQ2GBbScmHC41WG8lZc1a82acQc5Y2mOzqpahCNL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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