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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8410ad850a7b3dc5ccd57cfaa5f8524bde1f323e6e9f31ddaaafd4f96d76e04' 
  AND token = 'FY2KlhoJ0xkL1pAND9vN+8Z+ASg4zhmyfs9mxLZQhYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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