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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f246d21c47dab30384fe059011d8df852fdc1243a91f0668ad267c6221382f' 
  AND token = 'CfjZIVAmENhZf1we1JpDkeCKa1460Xil+4VhHb+K46I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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