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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc61d59d00129412105fcc24a734502722ff067addeaf48ac4598b50f74f09d2' 
  AND token = '4iurojQ793sV6WzwsnxL3u3Fa5fcRd2Jx9xL6H6hfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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