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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f9daf7c731dbaeeca8a573bc08fe29b848e3b32d91a86943a0ed3cae7cf2f2' 
  AND token = '0ooEvReI6MkihsPEjbfC1hJJXHc21a1B/XP5lGpeLsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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