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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657505287eff2db081875c9b0d2cc7426abf2a41dccc11fdadfb41e74c2e4870' 
  AND token = 'XHko+AUl8noDG6/xoxDK1ekJ7idrSh/tDIRc8w3wirc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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