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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec988915a5673c479612bc9d849b58c0d28459e865cd9cb87d3f44f209ca2a1' 
  AND token = 'wphC6MYNpiK5rvnvf5I6vy9dHZTuC5UCCl8BrOAFyC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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