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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64cf099d745e95428a1764b75defc29ff4ad7828fa2b943d3184db351754b04' 
  AND token = 'kdCcaSoOA2j0EePy2SGs1WnPP2TRc9H0zV5JL7UKYKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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