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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eb1da5ec6e79e19c83eb54fa7e37939188dfb86e112282bb4ae8048736ff1d' 
  AND token = 'xCbXY3P9F1zGFCzWcff0tNB2jBzg8vIMbci3NF/3xoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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