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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326e6a434758cc76bb291a139723e309a5b93281e19b7f9615f43ed7d460392e' 
  AND token = 'z1HrpsSp+q/2ohNezF1RQpf0w7UV1iIHuBl5FsWcIno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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