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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210d8bdaea16ed7c47ca5ae3a60cfb06deaf51844af1275188b2a5b1aef6cf1c' 
  AND token = 'BuvqO3jDUiMHWbLtbnR54GaMW/m91Zo76jbuEc+Udz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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