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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1c64bee147d955b849d1c35db2d5d91b79b79dd76c51d09b3fd3e3c5e06759' 
  AND token = 'zw/did3f6z/ykCjtR4zk6hRyzWjUQ8ezWWYYsw7QkVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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