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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f607d45bfa755cba8f86c6d01a0356aa22b7ad517fee19e683ee48f6b2ef251c' 
  AND token = 'FWHFfu02+piQGejamKb/YRKVbbQ6wasRiHwDrPlZH6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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