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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd7334750042fab1bd704dc85d7a024d2c862a4ff55a1d65f6f989a882413f9' 
  AND token = 'cyRLemSoGfmHbDlqh+gvbFFD541lFBqZK6XEFlD1e8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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