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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb83520a9a7825f9279eef22f9bbf967a49ec1e7a3a21a4f99bcda501aca97a' 
  AND token = '9Kkl2St1RpP7pDBiAGnBXp5/G0k/koUmZvvIDaP6LaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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