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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d182a40feb5b0598281913ebd66a001a7f3d2bcfdd21d373272cd9d07e8e00' 
  AND token = '1clSUtXbSmSSMEUxTWHZb2Ao9Wk7T0W8BcnpFeki43U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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