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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083838d93dbd0432ec12a0b88a0f705b1b95fb9e1499734bff29e06af60e4471' 
  AND token = 'AbtIMAUV21vcYCCrpdhY3qpIiRHXNQnXO8iG4nTaKYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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