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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090e87332ef7f9ec40a6304bbf334ab9abaf678c973ac10eb6360985cf8b24cc' 
  AND token = 'Nbk4Gbk7U5i20JJlDaFrqyDlGxuDxC6EP6zJIv3jIk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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