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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57f36e83f7eed8b2d331e48e6c1b878d58f0693b588087e7377f08b1b8fc1cd' 
  AND token = 'lAKHpqXzrPirwUnFUsBZD3qKDZo6UofH71iPMgWvfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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