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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8571b1762085f61de2e3864031bdf86ac49d2d2f19bbde4d6f05872d425c22f5' 
  AND token = 'P8ConfREXrB4xiUdwwkjHA3RLvnxmxtD2gXXs8lcDAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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