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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88764ffa2f2d2678264e37c341af5db83494bfe1ee4e7126440771d03f267418' 
  AND token = 'CobaYJyXl6YVABm9F7eKM4Q7aYn6LZ8p44yXz4uP7To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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