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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c08cb90bb435a6c0fc794d3679e20f50e0b0fd89b193a25708dfb9de34dac7e' 
  AND token = '7Uck9N26vSF0Cs9y0rFYcn6fbRf8iwrjFdBGE1je7Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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