SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0b01c2bc5cd2f95ee8589610bcb130cecff166106743eaea9a5fb87e14dd51' 
  AND token = 'yWWdlGg4Dq9UIHsY76sMwKKLMk//WQxCJoTmkPGK+ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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