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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c018dccaac68bcca995e1bfa2ac835e2c7c1a8e2cd9395e1429e21538f745e' 
  AND token = '2huqWZNZLttq0Ovn6cFWnDrkpxQtPAPm9ZGpk6gXqFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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