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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af447b5c75359a611089d4825085805c1fa8cd4e3ae5ef4a1a7414ae6f84640' 
  AND token = 'cUN3niHKZ7KZhearrVcf0moEYVG3TqWOTJp3k737Lag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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