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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b800aea29088afaa29bba9a044290bc2b075066dc5af7bb29efbacddf34dce8' 
  AND token = 'Pdr+1ULLUnFy7p4IKS9m3UzXaXIoJv9FkSIj8WSiKKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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