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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd607b5a9a1ccd22aa0c53121d449500014748878cb2ea80e628b9a4cd41599d1' 
  AND token = '9rFgeF6m7nIclIyTi0O3Q5+Em5KsP/5swexvl11EhVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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