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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12530b0d80b78ffa7a1564586e055431b3ef7efd2c8574c767d5649b837c67ea' 
  AND token = '0myhTStPDvBlh5nTSwsA84yDfNbcQtaxb6h/hc9bo1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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