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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5195b241b441e987a5a60774fa318d9ac429e4c17f9aad8ef8c1908fc9a58985' 
  AND token = 'iZIfpKpe94CslohFXnWrzRdfXAbKJKQYQmk+K3Aw//U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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