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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f31b96c7f366a56e68355924ad07fb8b03b6185bd1080b1c2ac2309693266ee' 
  AND token = 'eMfRaTclOrrN16iBbm9NfqTRTXDYyOFG6faHHpv0BxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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