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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bae0b9ca91a2fb2455e6608102bbdd6eb7c0d8fc9cdf4d0e871ec6f01e6f9b9' 
  AND token = 'mSGX9dFsEiQT+UF4f8IJy78YGrD4Q2u4lmi1gmDL31o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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