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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0609c5b57ee3e87d2beda63041d55ac993a64e27f074466d7e159baf6750a004' 
  AND token = '7+FSb2+vmAlWDrOnJbIdKW+BHsQzO+/nVVsYrLcPfA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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