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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3689ff7282c78cf45d62679ebcf960b01001c46034cbc5f55446bef95b069ec0' 
  AND token = 'zG1wA7coOUgCBGWRe4SsYaPn6zwePSX1QT4Hvx+tQRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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