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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dd26d8464e45a31181a7f540f079d318dad37cae54f0a134664e1daa73a3b7' 
  AND token = 'nbJ/Z+JsgJKN/uBJ78hkcRibOHKAte8989Kkydf83gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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