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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f210c15293a7fa79ae215a83881cde125de73f045897d7f9fececd5f367891cb' 
  AND token = 'wxWs4VnC4uPIDo16hCFXa2+81/cZ1e/8TIAkBLMqhiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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