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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a3e6a76c8f548740365886c26260ac84cf9b36c651082a1ef4d01349d9e4ef' 
  AND token = 'IY1HrBb2wea2B6onj/MHRcZH+LBIPcz4VaCmXKPZBDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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