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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c8ac82820c5c2fe1bb05d221e9f1d405f3863e11338cb6bf76996ecf0ef279' 
  AND token = '/GWaZspz+7abDUZejZzODVowOIiBk5af+yrD1VDVIjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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