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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317e48eda229ce2aae2a853abbca6d3ed46800fb86c32d7d15bde0493f2dc3a8' 
  AND token = 'mH1J06EU14zO8Zjvok1fu38fH8X7QJ+68ENIT+PRocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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