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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e9f617eed30da0ae7d540cf93def5740a4628c9c51307324fe5a5005d109d3' 
  AND token = 'DjMEWLokEqf3QzEdSTJAj6DA2203cam5p3cFlMGL8tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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