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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2a0fff5556af180f12050b0396607da6dba0c725940f4afac014aeb1e235e7' 
  AND token = 'a9bp3SGWLQ8WMaH2CHhC50SJ97y34JP9BL8289WgCrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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