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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47af9c45be76723830ca0bc8252af767239593b14a5de93f674079c1bd54e595' 
  AND token = 'jcTt6zXyPzhiF5OTAxfFq5x+mgwdrof4nakqs9UjPHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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