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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc33a714c0f958bcc0c04cda22bb3f08a898a620fed83d1b4227dcfdd46af4f8' 
  AND token = 'DYnBTGAVRgR1xCoqidJK76XChE55cBId/6zB3WzeilY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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