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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f512c8be3109045af653c20324b38df423ad4f1a9b544250282e531f011810' 
  AND token = 'C7NWW8HS9V5DEai46G+crybsTjGxT4WqhyHNS/uK54k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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