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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b614faa27e9d9aa3a02e3e6eeb8c1cc01eb00f373ca8e51aed58a9fc5a5bf76' 
  AND token = 'rzfZ0BUvhwz7L427zIMdWbCWHwppUfNjFakbaZ4Ifcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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