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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c683ef933feab27f468c0ba38efe90c6a8429b1913f5183db23900b52c6445a' 
  AND token = '7hNJGJoQDWck8TiaFHRT2ySZpeICw7TT+EXHae4l3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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