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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d918ab1c6d21a0d5eddbea18a8bc9961a44e0632e3ddf13982b3f83adb53c36' 
  AND token = 'bX5nwFwCSt1q4+2t0ojv21F3CmCs/zRVKjsQHx1S9MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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