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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56a98110e00a001dfba98043656841c7df35c541466b602b24e98ce478bf2ba' 
  AND token = 'd27pPKA0HhH1lAQrg1cTVNEgVCY5hDSZ1o1cI0RlOfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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