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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3069ec976ad50fff724ae3f5dbe133ba38876cedf72fe1209f8087cacd431a6' 
  AND token = 'UUxhpq8zgt8a48gTI+CMf78tOIoAr8pQzsnjTDGA/zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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