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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520e71b5dc7a92cf1570e9f45c3369594dcbeb8c6d854eb2d84296c8893baaa1' 
  AND token = '2BvGs/jF85AWX36/EdcSN+itn9DfUSVRC58p4Nq+1RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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