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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f652d0156cfceb42fb7de7326f78916b7da28c3c014d67d764d6943f476a4fd' 
  AND token = '8MJcw3jkzm/28oZf5+G2aEXB6tl67DFe/+6cfsNz5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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