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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea07742a457b0cfe73b264b3bc170b46d07f1dc63b04ab8297d4b17db45e038' 
  AND token = 'TjiITcz6iNyh3c858fItYgbiD39qyBlRp4+hyg9/xX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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