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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c336233876bc404c4c9e15d6683ea7a1236a585d4cc57aacaf3c6b5eb3019d' 
  AND token = 'uDjzqdq2xOk2K68kTUQXAmEKwM2X5Fu/J5JAx0X5n9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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