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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539636a7f9afd1949cc37233a81998dad719d5837eb37858f389fdfb98f1c157' 
  AND token = 'V/5fr3rg0mpNm2QU3u4f9mv9ZFIFTQ/mksZCb8aNbco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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