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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159bfdadc5b142490ee6776ffd36c687d1684573e348b57b174a4f0682857395' 
  AND token = 'fXWyv7CA+mUDcaX4mN82P6aqJlYhTol2qEc8GduBs8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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